Mario Bava Director, Cinematographer Barbara Steele Katia Vajda, Princess Asa Vajda Actor John Richardson Dr. Andre Gorobec Actor Ivo Garrani Prince Vajda Actor Andrea Checchi Dr. Thomas Kruvajan Actor Arturo Dominici Igor Javutich, Javuto Actor Enrico Olivieri Prince Constantine Vajda Actor Antonio Pierfederici Priest Actor Clara Bindi Inn Keeper Actor Germana Dominici Sonya Actor Mario Passante Nikita Actor Tino Bianchi Ivan Actor Massimo De Rita Producer Ennio De Concini Screenwriter Mario Serandrei Screenwriter, Film Editing Roberto Nicolosi Original Music Giorgio Giovannini Production Design Nedo Azzini Set Decoration Tina Grani Costume Design